Multichannel Decision Feedback Equalization in underwater sensor networks

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Multichannel Decision Feedback Equalization in underwater sensor networks Deepthi Chander (05407003) Pallavi Manohar (05407002)

description

Multichannel Decision Feedback Equalization in underwater sensor networks. Deepthi Chander (05407003) Pallavi Manohar (05407002). Features. Underwater acoustic channels-severely bandlimited Multipath –challenging issue Digital transmission-multipath causes ISI - PowerPoint PPT Presentation

Transcript of Multichannel Decision Feedback Equalization in underwater sensor networks

Page 1: Multichannel Decision Feedback Equalization in underwater sensor networks

Multichannel Decision Feedback Equalization in underwater sensor networks

Deepthi Chander (05407003)

Pallavi Manohar (05407002)

Page 2: Multichannel Decision Feedback Equalization in underwater sensor networks

Features

Underwater acoustic channels-severely bandlimited Multipath –challenging issue Digital transmission-multipath causes ISI Multichannel equalizer-exploits spatial diversity of

multipath Decision Feedback Equalizer (DFE) removes ISI

from previously estimated symbols Phase synchronization and equalization performed

jointly-Recursive least Squares (RLS) algorithm used for fast convergence

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Phase Coherent Multichannel Decision Feedback Equalizer (DFE)

feedforwardfilter 1x

1/Ts 1/T

Carrier

correction1

Input 1

feedforwrdfilter Kx

1/Ts 1/T

Carrier

correction K

Input K

.

.

.Σ + Symbol

decision

feedbackfilter

-

Estimated symbol

AdaptiveAlgorithm (RLS)

2nd order PLL Training symbol

+-

error

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THANK YOU

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Reduced Complexity Multichannel DFE

x1/Ts

Carrier

correction1

Input 1

x1/Ts

Carrier

correction K

Input K

.

.

.

Estimated symbol

Spatialpre-combiner

Multichannel DFE


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